The Birds

96-page collection of the webcomic of the same name. Back-cover description:

"Pete, a not so lovable loser always ready to become a fanatic for any cause, craves the respect of his coolly abusive best friend Steve. His wife, Shirley, pursues Steve while half-heartedly plotting Pete's demise. Her best friend, Loretta, signals her unrequited love for Pete by sending him severed raccoon heads. Eventually, Steve's Dad shows up, fresh out of prison. All of them are heavily armed.

"Finally appearing in print after providing years of appalling hilarity to readers of writer and game designer Robin D. Laws' blog, The Birds is a deadpan, minimalist missile aimed straight at the heart of the avian condition."

(In case it's not clear, the characters are bird-headed humans.)